<div>
    <p>
        Takes a map from branch names to closures and an optional argument <code>failFast</code>
        which will terminate all branches upon a failure in any other branch:
    </p>
    <pre>
    parallel firstBranch: {
        // do something
    }, secondBranch: {
        // do something else
    },
    failFast: true|false
    </pre>
</div>
